Stratigraphy of the Nilsen Plateau, Western Escarpment, Antarctica

Abstract

Field work resulting in this report was conducted in 1963-64. Sixteen sections along approximately 35 miles of escarpment were measured to provide data for this report. About 500 rock samples have been archived at the U.S. Polar Rock Repository at The Ohio State University. Rock sample descriptions and locations have been included with this report. Supporting details for statements made in this paper reside in files maintained by the author.

About 2000 feet of sedimentary rocks and at least an equal thickness of diabase dikes and sills rest on an ancient erosion surface, and are divided into five formations. In ascending order these are; Scott Glacier Formation, Roaring Formation, Amundsen Formation, Queen Maud Formation and the Nilsen Formation. The formations are mostly flat–lying, have been altered by heat from numerous diabase intrusions, and are locally displaced by high–angle faults. Non-uniform injection of diabase dikes and sills irregularly displaces sedimentary strata.